AN ENCAPSULATED COMPACT VACUUM CONTACTOR FOR LOW POWER APPLICATIONS

摘要

An encapsulated compact vacuum contactor for low power applications. The vacuum contactor (1) comprises at least one pole (2) comprising a tubular housing (3) of 7 - 10 mm thickness provided with spaced convolutions (4) along the length thereof and mounting means (5) and supporting means (35b). The tubular housing is directly mounted on the insulating bracket (8a) of the metallic framework (8) of an electromagnetic drive (9). The tubular housing is cast with an electrical grade low viscosity epoxy resin encapsulating a vacuum interrupter (13). The fixed electrode (17) of the vacuum interrupter protrudes out of the tubular housing and is provided with a terminal head (17a). The moving electrode (18) of the vacuum interrupter protrudes down through the bottom end plate (16b) thereof and is guided in an insulating material bush (21d) fitted to the bottom end plate. A drive insulator (22) comprises an inverted cup shaped portion (23) and a stem portion (24) provided with spaced convolutions (25) along the length thereof. The lower end of the moving electrode is fitted to the stem portion of the drive insulator. A drive rod (26) is disposed within the inverted cup shaped portion with its one end fixed to the bottom of the inverted cup shaped portion and its other end extending into the metallic framework of the electromagnetic drive and coupled to the electromagnetic drive and compression spring (27) stressed against the drive insulator. The compression spring is located within the inverted cup shaped portion over the drive rod. A flexible terminal (28) is fixed to the moving electrode and laterally protruding out of the housing and fixed to a lateral arm (30) of the housing.[IN-MUM-2006-00493A]